Amazingly, Project Runway is back for a sixth run, which demonstrates just how successful it is in the States, as well as showing how quickly fashion-reality series are churned out. No doubt refreshed for the world of couture by her stint on Ugly Betty, Lindsay Lohan is the first guest-judge of the season, as the 16 new wannabes are challenged to design a dress for the red carpet at the Emmys. Will the pressure prove too much? Darling, this is fashion: of course it will.

Farmer Wants a Wife

9pm, Five

This is about as enjoyable as spraying a field with manure. The producers have apparently forgotten that dating shows rely on competitiveness and conflict as much as romance for their interest, seeing as nothing really happens here, apart from Derek the farmer having to choose which woman he likes best. At least make them fight it out in the pigsty or something. Yeah, there's a "twist" at the end, but most likely because the producers realised that the preceding 40 minutes were so dull they had to try something. Too little way too late.

While Dragons' Den has been shown on BBC2, a parallel online version of the show has been up and running for some time now. There are just two dragons, Shaf Rasul and Julie Meyer, who both jot notes down furiously, in a broadly similar format where the inventors come seeking money in return for a percentage of their business. In one of the most popular online episodes, Alex Foreman seeks £30,000 to get his ladder-buddy business going. Radio 1's Dominic Byrne steps into Evan Davis's shoes to present.

Black, White & Gray

9.55pm, Sky Arts 1

Sam Wagstaff was the influential New York curator who fought to get photography taken seriously as an art form. Robert Mapplethorpe was the prodigiously talented photographer who became Wagstaff's much younger lover. This fascinating documentary follows their life, work and symbiotic relationship, in which Wagstaff was pulled into a world of hardcore gay sex and Mapplethorpe was guided by his well-connected lover into becoming a star of the art world. Patti Smith, a close friend of both, helps to explain the impact the pair made and the forces that drove them.